How much can be gained from a few octane
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
How much can be gained from a few octane Assuming you tune for it how much can be gained going from 93 octane to 96? I'm just considering options and one thing I was considering is mixing 100 octane unleaded 50/50 with 93 octane e10. They both have a stoich around 14.1 which should make tuning easier.
Thoughts?
Thoughts?
TECH Apprentice
Joined: Apr 2016
Posts: 313
Likes: 16
From: Lincoln, NE
Enginelabs just did a few tests between different grades of race fuels un-tuned/tuned was pretty interesting.
http://www.enginelabs.com/engine-tec...ls-fight-back/
http://www.enginelabs.com/engine-tec...ls-fight-back/
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
I currently don't have the fuel system for it. I have a 340 lph single pump in the stock bucket and 60 lbs injectors. I'm running 9 pounds cam only sbe. I thought that would hold me over for a year, but even though I just finished tuning it I already want more.
The plan is to hopefully make it until May(I can't keep my foot out of it) to make it's first track passes at it's current 9 psi. Then I would like to go up to 12 psi and run it at the local no prep event in the hard tire class.
So with my current fuel system my best options are stick with 93 and super low timing, add meth, or some percentage mixture of 100 octane. I got a quick response from alky control and they sent me their install pdf. After reading through it there were a couple issues that made me second guess the meth route although I haven't ruled it out. I'm just considering options now.
Next winter I plan to address several issues to move towards the next level including a proper return system with dual pumps. At that time E85 will become the primary option.
The plan is to hopefully make it until May(I can't keep my foot out of it) to make it's first track passes at it's current 9 psi. Then I would like to go up to 12 psi and run it at the local no prep event in the hard tire class.
So with my current fuel system my best options are stick with 93 and super low timing, add meth, or some percentage mixture of 100 octane. I got a quick response from alky control and they sent me their install pdf. After reading through it there were a couple issues that made me second guess the meth route although I haven't ruled it out. I'm just considering options now.
Next winter I plan to address several issues to move towards the next level including a proper return system with dual pumps. At that time E85 will become the primary option.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
I'm not seeing any fuel delivery problems as of now. Injector duty cycle about 82% at 6400 now and still a bit rich. The only pressure gauge I have is rail mounted so I can't see what it is doing during a wot pull. It's possible that I'm tuning around a fuel pressure drop, but definitely not going lean anywhere.
If you have pressure drop concerns replace the gauge at the rail with this and wire it into the egr pintle position.
https://www.amazon.com/gp/aw/d/B00RCPDPRQ/ref=mp_s_a_1_1?ie=UTF8&qid=1517440070&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=100+p si+transducer&psc=1
https://www.amazon.com/gp/aw/d/B00RCPDPRQ/ref=mp_s_a_1_1?ie=UTF8&qid=1517440070&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=100+p si+transducer&psc=1
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Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
If you have pressure drop concerns replace the gauge at the rail with this and wire it into the egr pintle position.
https://www.amazon.com/gp/aw/d/B00RC...ansducer&psc=1
https://www.amazon.com/gp/aw/d/B00RC...ansducer&psc=1
Injectors are 60 lbs at 43.5 base pressure so they are over 70 lbs capable at 58 psi. If fuel pressure dropped and I was tuning around it wouldn't it effect injector duty cycle as well?
I really probably need to live with my current power level until I put a real fuel system in it.
There were issues with meth systems I didn't like. Possibility of the line not being full so when the system is first triggered by boost it wouldn't get meth right away. Or seepage through the nozzle. Or other issues. I see no point in adding it if I'm not confident enough in it to tune for it.
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Verdad Gallardo Change in DC depends on pressure drop and would you really pick up on a few percent difference in DC, even 5 percent? I'm with you on the meth thing, too many possible problems but the good tuners say tune without it and then add it so if it fails you're still safe, but then you don't gain as much.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Change in DC depends on pressure drop and would you really pick up on a few percent difference in DC, even 5 percent? I'm with you on the meth thing, too many possible problems but the good tuners say tune without it and then add it so if it fails you're still safe, but then you don't gain as much.
I don't have any direct experience with them, but they seem like a good idea for high hp (>800whp) or drag setups. Most people don't have any issues throwing a 255/340/450 or 2 in the tank. I ran twin 255's for years with no problems.
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
Assuming you tune for it how much can be gained going from 93 octane to 96? I'm just considering options and one thing I was considering is mixing 100 octane unleaded 50/50 with 93 octane e10. They both have a stoich around 14.1 which should make tuning easier.
Thoughts?
Thoughts?
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Sure I get that. At 9 pounds with 93 I'm at 14 timing advance at peak boost. Just curious if at 12 pounds there would be much benefit going up to 96 octane because I'm sure I'll be spark limited.